I was very much worried about this problem. Thank you!
OMG thank you!!! I have been trying for a week.
Thanks a million times!!!
Like everyone else, I was worried and didn't have a clue.
I've been looking for a correct answer for a long time!
Other:

This is NOT abusive. I pressed this button by accident.It is spam / self promotion.It is offensive or harmful.It does not contain enough information.It contains or requests illegal information.It does not make sense.

"This all not work bring it to nokia care center..

hope..."

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If you enter even ONE incorrect code, the default 12345 will not be accepted
To reset to the default code, so the following: – turn off phone – remove battery – press and hold POWER button for at least 10 seconds – replace battery and cover – turn phone ON – do not touch keyboard for at least 15 minutes – default 12345 code will now work

"Bring it to the nokia care center...."

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Try to get the IMEI of the phone which is at the back of the phone under the battery.
Once you have the IMEI, go to this link on your browser.[LINK VISIBLE TO REGISTERED USERS - CLICK HERE TO SEE THIS LINK]
Enter the IMEI and click generate.
Once you have the code, try to input it on your device.
You have to carefully check what you input.
You can only try it once.
If it is not working, bring it to the Nokia Care Center.

You can easily RESET the settings your Nokia 1661 device VIA pressing: * + 3 + call + Power on. Before the device is reset, you need to provide the lock code. The default lock code is 12345.

Alternate method if above instruction wont work:
You can Reset your device by typing *#7370# in standby mode. Before the device is reset, you need to provide the lock code. The default lock code is 12345.

First u have try think of ur password correctly then if u won`t get to remember it then firstly I have to say that if u fail ursecurity pass word once wrong then 1111 1234,00000,12345,01234,2222,9999 won`t work so only way is take it to company repair center and make it reboot or format ur PC and install new one that`s all.